problem with gatsby-plugin-intl and gatsby-plugin-mdx

Question

My blog posts are as following:

posts
     /post-1
            /en.mdx
            /fr.mdx

I created a page for each in gatsby-node.js file as following:

...
createPage({
        path: `/${lang}/post/${node.frontmatter.slug}/`,
        component: `${postTemplate}?__contentFilePath=${node.internal.contentFilePath}`,
        context: {
          id: node.id,
          slug: node.frontmatter.slug,
          lang: lang,
        },
      });
...

But if I go to url /fr/post/post-1 (or en), as gatsby-plugin-intl creates /en/... and /fr/..., it redirects it to /en/en/post/post-1 or /fr/fr/post/post-1.

Any solution?